// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'));
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror'], mod);
  // Plain browser env
  else mod(CodeMirror);
})(function(CodeMirror) {
  'use strict';

  CodeMirror.defineMode('d', function(config, parserConfig) {
    var indentUnit = config.indentUnit,
      statementIndentUnit = parserConfig.statementIndentUnit || indentUnit,
      keywords = parserConfig.keywords || {},
      builtin = parserConfig.builtin || {},
      blockKeywords = parserConfig.blockKeywords || {},
      atoms = parserConfig.atoms || {},
      hooks = parserConfig.hooks || {},
      multiLineStrings = parserConfig.multiLineStrings;
    var isOperatorChar = /[+\-*&%=<>!?|\/]/;

    var curPunc;

    function tokenBase(stream, state) {
      var ch = stream.next();
      if (hooks[ch]) {
        var result = hooks[ch](stream, state);
        if (result !== false) return result;
      }
      if (ch == '"' || ch == "'" || ch == '`') {
        state.tokenize = tokenString(ch);
        return state.tokenize(stream, state);
      }
      if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
        curPunc = ch;
        return null;
      }
      if (/\d/.test(ch)) {
        stream.eatWhile(/[\w\.]/);
        return 'number';
      }
      if (ch == '/') {
        if (stream.eat('+')) {
          state.tokenize = tokenNestedComment;
          return tokenNestedComment(stream, state);
        }
        if (stream.eat('*')) {
          state.tokenize = tokenComment;
          return tokenComment(stream, state);
        }
        if (stream.eat('/')) {
          stream.skipToEnd();
          return 'comment';
        }
      }
      if (isOperatorChar.test(ch)) {
        stream.eatWhile(isOperatorChar);
        return 'operator';
      }
      stream.eatWhile(/[\w\$_\xa1-\uffff]/);
      var cur = stream.current();
      if (keywords.propertyIsEnumerable(cur)) {
        if (blockKeywords.propertyIsEnumerable(cur)) curPunc = 'newstatement';
        return 'keyword';
      }
      if (builtin.propertyIsEnumerable(cur)) {
        if (blockKeywords.propertyIsEnumerable(cur)) curPunc = 'newstatement';
        return 'builtin';
      }
      if (atoms.propertyIsEnumerable(cur)) return 'atom';
      return 'variable';
    }

    function tokenString(quote) {
      return function(stream, state) {
        var escaped = false,
          next,
          end = false;
        while ((next = stream.next()) != null) {
          if (next == quote && !escaped) {
            end = true;
            break;
          }
          escaped = !escaped && next == '\\';
        }
        if (end || !(escaped || multiLineStrings)) state.tokenize = null;
        return 'string';
      };
    }

    function tokenComment(stream, state) {
      var maybeEnd = false,
        ch;
      while ((ch = stream.next())) {
        if (ch == '/' && maybeEnd) {
          state.tokenize = null;
          break;
        }
        maybeEnd = ch == '*';
      }
      return 'comment';
    }

    function tokenNestedComment(stream, state) {
      var maybeEnd = false,
        ch;
      while ((ch = stream.next())) {
        if (ch == '/' && maybeEnd) {
          state.tokenize = null;
          break;
        }
        maybeEnd = ch == '+';
      }
      return 'comment';
    }

    function Context(indented, column, type, align, prev) {
      this.indented = indented;
      this.column = column;
      this.type = type;
      this.align = align;
      this.prev = prev;
    }
    function pushContext(state, col, type) {
      var indent = state.indented;
      if (state.context && state.context.type == 'statement')
        indent = state.context.indented;
      return (state.context = new Context(
        indent,
        col,
        type,
        null,
        state.context,
      ));
    }
    function popContext(state) {
      var t = state.context.type;
      if (t == ')' || t == ']' || t == '}')
        state.indented = state.context.indented;
      return (state.context = state.context.prev);
    }

    // Interface

    return {
      startState: function(basecolumn) {
        return {
          tokenize: null,
          context: new Context((basecolumn || 0) - indentUnit, 0, 'top', false),
          indented: 0,
          startOfLine: true,
        };
      },

      token: function(stream, state) {
        var ctx = state.context;
        if (stream.sol()) {
          if (ctx.align == null) ctx.align = false;
          state.indented = stream.indentation();
          state.startOfLine = true;
        }
        if (stream.eatSpace()) return null;
        curPunc = null;
        var style = (state.tokenize || tokenBase)(stream, state);
        if (style == 'comment' || style == 'meta') return style;
        if (ctx.align == null) ctx.align = true;

        if (
          (curPunc == ';' || curPunc == ':' || curPunc == ',') &&
          ctx.type == 'statement'
        )
          popContext(state);
        else if (curPunc == '{') pushContext(state, stream.column(), '}');
        else if (curPunc == '[') pushContext(state, stream.column(), ']');
        else if (curPunc == '(') pushContext(state, stream.column(), ')');
        else if (curPunc == '}') {
          while (ctx.type == 'statement') ctx = popContext(state);
          if (ctx.type == '}') ctx = popContext(state);
          while (ctx.type == 'statement') ctx = popContext(state);
        } else if (curPunc == ctx.type) popContext(state);
        else if (
          ((ctx.type == '}' || ctx.type == 'top') && curPunc != ';') ||
          (ctx.type == 'statement' && curPunc == 'newstatement')
        )
          pushContext(state, stream.column(), 'statement');
        state.startOfLine = false;
        return style;
      },

      indent: function(state, textAfter) {
        if (state.tokenize != tokenBase && state.tokenize != null)
          return CodeMirror.Pass;
        var ctx = state.context,
          firstChar = textAfter && textAfter.charAt(0);
        if (ctx.type == 'statement' && firstChar == '}') ctx = ctx.prev;
        var closing = firstChar == ctx.type;
        if (ctx.type == 'statement')
          return ctx.indented + (firstChar == '{' ? 0 : statementIndentUnit);
        else if (ctx.align) return ctx.column + (closing ? 0 : 1);
        else return ctx.indented + (closing ? 0 : indentUnit);
      },

      electricChars: '{}',
    };
  });

  function words(str) {
    var obj = {},
      words = str.split(' ');
    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
    return obj;
  }

  var blockKeywords =
    'body catch class do else enum for foreach foreach_reverse if in interface mixin ' +
    'out scope struct switch try union unittest version while with';

  CodeMirror.defineMIME('text/x-d', {
    name: 'd',
    keywords: words(
      'abstract alias align asm assert auto break case cast cdouble cent cfloat const continue ' +
        'debug default delegate delete deprecated export extern final finally function goto immutable ' +
        'import inout invariant is lazy macro module new nothrow override package pragma private ' +
        'protected public pure ref return shared short static super synchronized template this ' +
        'throw typedef typeid typeof volatile __FILE__ __LINE__ __gshared __traits __vector __parameters ' +
        blockKeywords,
    ),
    blockKeywords: words(blockKeywords),
    builtin: words(
      'bool byte char creal dchar double float idouble ifloat int ireal long real short ubyte ' +
        'ucent uint ulong ushort wchar wstring void size_t sizediff_t',
    ),
    atoms: words('exit failure success true false null'),
    hooks: {
      '@': function(stream, _state) {
        stream.eatWhile(/[\w\$_]/);
        return 'meta';
      },
    },
  });
});
